Answer this question truthfully
### Question: Who is at highest risk for Chronic lymphocytic leukemia ?
### Response: Clinical data has suggested that the development of chronic lymphocytic leukemia is related to several factors.
Certain chemical exposures: Studies suggest that some herbicides and insecticides used in farming may increase the risk of chronic lymphocytic leukemia.
Family history: Epidemic survey show that first-degree relatives of chronic lymphocytic leukemia patients have an increased risk for this cancer.
Gender: Clinical data show chronic lymphocytic leukemia is more common in men than women.
Race: Chronic lymphocytic leukemia is more common in North America and Europe than in Asia.